/* send an attention. this may get called at any time, so we can't use
* DSI buffers to send one.
return 0 on error
*/
int dsi_attention(DSI *dsi, AFPUserBytes flags)
{
/* header + AFPUserBytes */
char block[DSI_BLOCKSIZ + sizeof(AFPUserBytes)];
u_int32_t len, nlen;
u_int16_t id;
if (dsi->flags & DSI_SLEEPING)
return 1;
if (dsi->in_write) {
return -1;
}
id = htons(dsi_serverID(dsi));
flags = htons(flags);
len = MIN(sizeof(flags), dsi->attn_quantum);
nlen = htonl(len);
memset(block, 0, sizeof(block));
block[0] = DSIFL_REQUEST; /* sending a request */
block[1] = DSIFUNC_ATTN; /* it's an attention */
memcpy(block + 2, &id, sizeof(id));
/* code = 0 */
memcpy(block + 8, &nlen, sizeof(nlen));
memcpy(block + 16, &flags, sizeof(flags));
/* reserved = 0 */
/* send an attention */
return dsi_stream_write(dsi, block, DSI_BLOCKSIZ + len, DSI_NOWAIT);
}
void dsi_close(DSI *dsi)
{
/* server generated. need to set all the fields. */
if (!(dsi->flags & DSI_SLEEPING) && !(dsi->flags & DSI_DISCONNECTED)) {
dsi->header.dsi_flags = DSIFL_REQUEST;
dsi->header.dsi_command = DSIFUNC_CLOSE;
dsi->header.dsi_requestID = htons(dsi_serverID(dsi));
dsi->header.dsi_code = dsi->header.dsi_reserved = htonl(0);
dsi->cmdlen = 0;
dsi_send(dsi);
dsi->proto_close(dsi);
}
free(dsi);
}
/* server generated tickles. as this is only called by the tickle handler,
* we don't need to block signals. */
int dsi_tickle(DSI *dsi)
{
char block[DSI_BLOCKSIZ];
uint16_t id;
if ((dsi->flags & DSI_SLEEPING) || dsi->in_write)
return 1;
id = htons(dsi_serverID(dsi));
memset(block, 0, sizeof(block));
block[0] = DSIFL_REQUEST;
block[1] = DSIFUNC_TICKLE;
memcpy(block + 2, &id, sizeof(id));
/* code = len = reserved = 0 */
return dsi_stream_write(dsi, block, DSI_BLOCKSIZ, DSI_NOWAIT);
}
